Rotation release for rock drills



Dec. 11,1923; v 1,476,814

H. A. GUILEY ROTATION RELEASE FOR ROCK DRILLS Filed Oct. 23, 1920 Patented Dec. 11, 1923.

o vrrau stares HENRI AUGUSTUS GUILEY, 9F EASLUN, PENNSYLVANEA,

PATENT OFFICE.

ELSSIGNOR TO INGERSOLL- BAND COHZPANY, Q11 JERSEY CITY, NEW-JERSEY, CUPVLPGREEIUNOE NEW JERSEY.

'EOIATION BLUCK DPJILLS.

Application filed October 23, 1526. Serial No, -.1@,92$.

To aZZ whom itmay concern;

Be it known that l, HENRI AUeUsrUs G-UiLEY, a citizen of the United States, and r a resident ofEaston, county of Northainpton, and State of Pennsylvania, have invented certain new and useful Improvements in Rotation Releases for Rock Drills, of which the toll wing is a specification.

This invention relatesto rock drills of the hammer type having automatic rotation for the drill steel,'as for instance rifle bar rotation, but relates nioreparticularly to a device for releasing the rotation when desired.

The primary object of the invention is to enable the operator to change from a positive or substantially positive rotation to a slip rotation at will, as for instance in hard ground.

if the drill steel sticks, it may be desirable to release the positive rotation and permit the hammer to operate with slip rotation or operate without rotating the drill steel, until the normal rotation can be resumed, and my rotation releasing device accomplishes these objects'in a simple and efficient manner and without complication of; parts. i

To these ends the invention shown in one of its preferred forms in the accoinpanying drawings, in which- Figure 1 is a longitudinal sectional elevation of a portion of a rock drill contain-- ing the device, and taken on the line 1-1 of Figure 2, looking in the direction or the arrows,

Figure 2 is a transverse sectional elevation taken on the line 22 of Figure 1, and

Figure 3 is a detail sectional view of a modification of the brake adjusting mechanism.

In order to illustrate the invention, a fluid pressure actuated rook drill oi the harn-- mer type having a rifle bar rotation is illus trated, only so much of the machine and its operative partsv being shown as will serve to make the invention clear, the complete showing of the ports and passages for the supply of motive fluid to the hammer cylinder being omitted as forming no part of the present invention.

teeth oi the rotation ratchet ring Referring to the drawings, the hammer piston A which may be of any suitable or usual construction, 'is adapted to reciprocate in the cylinder B and is actuated by fluid pressure supplied and distributed in any suitable manner.

The piston A or its rearward extension is hollow and engagesthe rifle bar G having a' head D located between the rotation Washer E and the back-head F of the ma chine. The rifle bar head is provided with a gudgeon G having a bearing in the back head F and in the form of construction shown, a strong cushion spring H, preterablya leaf spring, bears against the back head F and through bolts J passing through the cushion spring H and lugs R on the cylinder in the usual manner hold the parts together.

The rifle bar head D is provided with the rotation pawls L adapted to en age the V 6, which surrounds the head D and is adapted to be held from rotation by means of the rota tion releasing device forming the principal subject matter of this invention and shown as a brake band P substantially encircling the periphery of the rotation ratchet ring 0.

Means are provided for tightening and loosening the brake band in order to change from substantially, positive to slip rotation and in this instance, a bolt Q extends transversely through the cylinder B adjacent the rotation ratchet ring, so that the shank R of the bolt lies in a chamber S formed in the cylinder. The inner end of the bolt has a bearing at T in the cylinder and the head U of the bolt is provided with a packing gland and the lock nuts W and X. The shank it of the bolt passes through one end Y of the brake band P and also passes through the apertures a and b in the other reversely bent threaded portion d of the bolt in a direction to tighten or loosen the brake band as desired,=,and either provides positive or sub stantially positive rotation for a drill steel or slip rotation for a drill steel. After the rotation-has been adjusted as desired, the lock nutsl V and X are tightened and should remain tightened during the operation of the ,machine. 7

-The. .packing gland .V makes a tight joint around the head U of the/bolt Q and in order to avoid loss of pressure by leakage in the construction, a seal is made at the periphery of the inner face 6 of the back head F and this may conveniently be done by counter boring the back end of the cylinder into Which counter bore the back head F is fitted for a portion of its thickness. 7 Any fluid pressure which may enter the space between the rotation Washer E and the back head F due to between the meeting surfaces at the bottom of the socket and the inneri'ace of the collar U should preferably be a machined joint, Which'seals the bolt -Without the requirement of packing at this point. A screw plug h having ahead j forces the collar ,U tightly against the bottom of; the socket and the parts are locked in position by means of a suitable lock nut is outside of the plug 11.. In this modification the head 0 of the adjustable brake bolt is preferably squared for ad justing purposes.

I claim:

1. A rock drill of the hammer type having positive automatic rotation for a drill stee including a cylinder, a ratchet ring, a brake band cooperating with said ratchet ring and located Within the cylinder, a longitudinally immovable bolt, passing through the wall of the cylinder and both ends of said band, a nut on said bolt, one end of said band being secured on the bolt and the other end being adapted to be moved in either direction by engagement with said nut for tightening and loosening said brake to change from substantially positive to slip rotation and external screw threaded means for positively securing said bolt in adjusted position, said means including a fluid-tight seal for preventing leakage past said bolt.

2. A rock drill of the hammer type having positive automatic rotation for a drill steel including a cylinder, a ratchet ring, a brake band cooperating with said ratchet ring and located Within the cylinder, a bolt passing through the cylinder and both ends of said band, a nut on said bolt, one end of said band being secured on the bolt against relative movement and the other end being reversely bent on the bolt and enclosing said nut, said reversely bent end being adapted to be moved in either direction by engagement with said nut for tightening and loosening said brake to change from substantially positive to slip rotation.

In testlmony whereof I have signed this specification.

HENRI AUGUSTUS GUILEY. 

